import sys
input = sys.stdin.readline

def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    x=I()
    t=1800
    for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200

main() import sys sys input = sys.stdin.readline input sys.stdin.readline sys.stdin sys stdin readline def I(): return int(input()) I def MI(): return map(int, input().split()) MI def LI(): return list(map(int, input().split())) LI def main():
    mod=10**9+7
    x=I()
    t=1800
    for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200 main mod=10**9+7 mod 10**9+7 10**9 10 9 7 x=I() x I() I t=1800 t 1800 for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200 i range(10) range 10 if x>=t:
            print(i+1)
            exit()
         x>=t x t print(i+1) print i+1 i 1 exit() exit t-=200 t 200 main() main def main():
    mod=10**9+7
    x=I()
    t=1800
    for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200 def main():
    mod=10**9+7
    x=I()
    t=1800
    for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200 main def I(): return int(input()) def I(): return int(input()) I def MI(): return map(int, input().split()) def MI(): return map(int, input().split()) MI def LI(): return list(map(int, input().split())) def LI(): return list(map(int, input().split())) LI input = sys.stdin.readline sys.stdin.readline input
import sys
input = sys.stdin.readline

def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    x=I()
    t=1800
    for i in range(10):
        if x>=t:
            print(i+1)
            exit()
        t-=200

main()
